Safety-valve.



No. 745,002. PATENTED NOV. 24, 1903.

LE ROY DEVERS 6:0. E. DUNN.

SAFETY VALVE.

APPLICATION FILED MAR. 21. 1903.

N0 MODEL.

Fig.1

INVENTOHS.

ATTORNEY Patented November 24, 1905.

UNITED STATES PATENT Crricn.

LE ROY DEVERS AND CLARENCE E. DUNN, OF DAYTON, ()lIIO.

SAFETY-VA LVE.

SEEGIFICATIOH forming part of Letters Patent No. 745,002, dated November24, 1903.

Application filed March 21, 1903. Serial No. 148,947. (No model.)

To ctZZ whom, it may concern:

Be it known that We, LE ROY DEVERs and CLARENCE E. DUNN, citizens of theUnited States, residing at Dayton, in the county of Montgomery and Stateof Ohio, have invented certain new and useful Improvements inSafety-Valves; and we do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to theletters of referencemarked thereon, which form a part of this specification.

This invention comprises a safety-valve or cut-oif for natural andartificial gases and possesses the new and useful features hereinafterdescribed and claimed.

The object of the invention is to provide a cut-off or safety devicewhich is absolutely and at all times reliable in its operation.

Preceding a detail description of the invention reference is made to theaccompanying drawings, of which- Figure 1 is an elevation of ourimproved safety-valve. Fig. 2 is a vertical section.

In a detail description of the invention similar reference charactersindicate corresponding parts.

A designates a union of special construction, the ends of which aretapped to receive distributing-pipes A. The said union has a channel Bthrough its longitudinal center, which communicates with thedistributingpipes and which is intersected by a conicalshaped valve'seatD, that extends entirely through the body of the union. The upperportion of the said union terminates in a suitable offset 0, throughwhich the said valveseat extends and the upper surface of which is flatin order to properly receive the lower edge of a diaphragm G around thevalve-seat. The said diaphragm consists of a series of bellows foldswhich inflate and collapse according to the pressure of the gas exertedon the interior thereof. The lower end of this diaphragm is secured tothe upper fiat surface of the oifset C by means of a suitable washer H,so that the lower extreme end of said folding diaphragm is immovable.The

. upper end of said folding diaphragm is continuous, as at J, and issecured to the under side of a disk I, which moves freely within thecasing L, said casing being properly secured to the circumference of theoifset C and having a cap M.

E designates an elongated valve which fits in the seat I) and has itsstem F projected upwardly through the center of the folding diaphragmand made secure at its upper end to the disk I by means of a nut K orotherwise. It will be seen that this valve E is of a very slight taperfrom a vertical line. This is an important feature, for the reason thatwhen the valve is in its seat there will be no possibility of thepressure raising it until after the initial lift has been given it bythe set screw N. The folding diaphragm G, it will therefore be seen,raises the valve E from its seat across the channel B when the flow ofgas through the distributing-pipes is normal. At such times the interiorof the folding diaphragm is filled with the necessary pressure tomaintain the valve from its seat, as shown in Fig. 2. The lower extremeend of the valveseat D is adapted to receive a liftingscrew N, by meansof which the valve is suf ficiently raised from its seat to permit ofthe gas-pressure lifting said valve at such times when the pressure ofgas rises to its normal state. In other words, should the pressure ofgas suddenly give out or diminish the weight of the valve will causesaid valve to drop into the seat with the end thereof in suitableproximity to the end of the liftingscrew N. \Vhen the valve is in thisposition, it is manifest that the channel or passage B will be closedand the gas thus prevented from entering the interior of the foldingdiaphragm, as well as prevented from passing through thedistributing-pipes. When it is desired to sufliciently raise the valveto permit of this normal pressure of the gas having its proper effect toopen said valve, the lifting-screw N is turned sufficiently to dislodgethe valve E from its seat, and thereby permit a sufficient opening forthe gas to enter the interior of the folding diaphragm.

Having described our invention,we claim- 1. In a safety-valve, a unionhaving a gaspassage extending through its longitudinal center, saidunion having an offset on its upper side through which extends aconicalshaped valve-seat, said valve-seat receiving at its lower end alifting-screw, an elongated valve adapted to properly fit saidvalve-seat and to lie in proximity to said screw when said valve isseated, a folding diaphragm having one end secured to the upper side ofsaid offset, the upper end of said diaphragm being secured to a diskwhich is freely movable under the expanding and contracting movements ofthe folding diaphragm, the stem of the valve being connected to saiddisk so that the folding diaphragm is movable according to the pressureof the gas exerted on the interior thereof, and the valve is controlledand thereby maintained from its seat or permitted to seat, substantiallyasset forth.

2. In a safety-valve, a union having a longitudinal gaschannel throughits center which is intersected by a Valve-seat, said union having anoffset on its upper side LE ROY DEVERS. CLARENCE E. DUNN.

VViinesses:

R. J. MCCARTY, H. H. HABERER.

